The following six sentences come from a paragraph. The first and the last sentences are given. Choose the order in which the four sentences (PQRS) should appear to complete the paragraph.
S1. He took two cigarettes from my case
P. But when the fit of coughing was over, he placed it between his lips
Q. He lit one of them and placed it between the lips
R. Then with a feeble hand he removed the cigarette
S. Slowly he took a pull at it and coughed violently
S6. Then he continued to draw on it